On Mon, 11 Apr 2005 01:32:32 GMT, Greg wrote:



From: David
Organization: EarthLink Inc. -- http://www.EarthLink.net
Newsgroups: rec.radio.shortwave
Date: Sun, 10 Apr 2005 19:12:24 GMT
Subject: Power Supples

On Sun, 10 Apr 2005 17:47:40 GMT, Greg wrote:

Okay, thanks to all who replied.

The people at

http://www.innovatronix.com/cgi-bin/...alog/index.asp

are marketing these power inverters to run studio strobes on location, which
implies, though they don't actually say so, that they run off a vehicle
battery and supply ample VDC for the studio strobes, which require recycling
large capacitors as rapidly as possible.

My interest would be in using an 12VAC inverter to supply 13VDC voltage for
my NRD-525, in hopes of eliminating power line noise (as well as powering
several potable, battery-operated radios). From what you guys are telling
me, either a linear or switching power supply would work, but filtering is
the critical factor. (This isn't a big priority - most noise at my location
is radiated noise.)

Greg

Why all the riggamarole? Why not just run the radio off the
aforementioned vehicle ballery?

I was considering a more permanent power supply to run the radio at home
independent of the house wiring. So, I wasn't considering using the
Innovatronix inverters, but their description lead to my question about
"sine wave" (prob meaning "linear") vs switching power supplies. Also, I
thought the Innovatronix gear might be of some interest to the group here.

I guess I wasn't too clear.

Greg

Build a nice beefy TransformerFullWave BridgeChoke Input Filter DC
Power Supply With Very Low Ripple. Then use a Premium Quality Low
Noise DCC Coverter for each radio.